Distant Horizons has added Shader support but your shader pack does not seem to work with it.

Is there any setting to enable it? Distant horizons is working when the shaders are not loaded, when I load Makup ultra fast (9.0) they disappear, even if disabling fog

Distant Horizons support would be amazing!

Distant Horizons Now Has Support to Make Up Ultra Fast, 9.0 its now Released

There is no option. It should work automatically.

Checklist:

• Verify that you are using the minimum versions of each component: Minecraft 1.20.1 or higher, Iris 1.7 or higher, Distant Horizons 2.0.3 or higher (it does not work on Optifine, it is an exclusive feature of Iris).
• MakeUp does not use Distant Horizons in custom dimensions, only in the Overworld, Nether, and The End.
• Try testing by disabling all mods except the shaders and Distant Horizons.

Something must be wrong on your side. It doesn’t make sense. The shader has everything it needs to be compatible with DH, and no reports have been received regarding this except yours.

Download the shader again from an "official" channel (GitHub, CurseForge, Modrinth) and make sure it is version 9.0.

Check the version of all components again.

Do other shaders with DH support work?

There is no option. It should work automatically.

Checklist:

* Verify that you are using the minimum versions of each component: Minecraft 1.20.1 or higher, Iris 1.7 or higher, Distant Horizons 2.0.3 or higher (it does not work on Optifine, it is an exclusive feature of Iris).

* MakeUp does not use Distant Horizons in custom dimensions, only in the Overworld, Nether, and The End.

* Try testing by disabling all mods except the shaders and Distant Horizons.

Yeah I've verified the version, I'm positive I'm using Iris, I'm in a simple world, no custom dimensions and I've done exactly that, moved all the mods and reinstalled only iris, fabric, sodium, DH and the other thing DH needs

Do other shaders with DH support work?

I've only tried yours that's in the support list because I liked it better than the others. I can confirm that with shaders unloaded DH works, I'll try with others. As you said it must be on my end
I'll get back to you if I manage to understand something, thanks for the support and for making the shader

I'm very sorry I can't help you, there's really nothing additional I can do. My advice would be to check the logs when loading and compiling the shaders. Maybe it will give you a clue.